The Welfare Economics of an Excise-Tax Exemption for Biofuels

Author

Abstract

A general theory is developed to analyze the efficiency and income distribution effects of a biofuel consumer tax credit and the interaction effects with a price contingent farm subsidy. Using the U.S. ethanol market as a stylized example, ethanol prices rise above the gasoline price by the amount of the tax credit. Corn farmers therefore gain directly while gasoline consumers only gain from any reduction in world oil prices due to the extra ethanol production and domestic oil producers lose. Because increased ethanol production improves the terms of trade in both the export of corn and the import of oil, we determine the optimal tax credit and the conditions affecting it. Historically, the intercept of the ethanol supply curve is above the gasoline price. Hence, part of the tax credit is redundant and represents ‘rectangular’ deadweight costs. The tax credit reduces the tax costs of price supports but incurs tax costs itself and increases consumer costs of corn. Price supports eliminate, create, have no effect or have an ambiguous effect on rectangular deadweight costs, depending on whether there is ex ante or ex post water in the tax credit. There are situations where ethanol production occurs only because of price supports. A stylized empirical model of the U.S. corn market is calibrated to illustrate the welfare effects of a tax credit. Net social costs of the tax credit averaged $683 million. Rectangular deadweight costs averaged $1,056 mil., more than offsetting the improved terms of trade and reduced price contingent farm subsidies, and representing over 50 percent of the tax cost of the tax credit.

Statistics

Corrections

All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:pra:mprapa:5151. See general information about how to correct material in RePEc.

If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

If CitEc recognized a reference but did not link an item in RePEc to it, you can help with this form .

If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

Please note that corrections may take a couple of weeks to filter through
the various RePEc services.